20211002121222 has 144 divisors (see below), whose sum is σ = 50077303750656. Its totient is φ = 5880308464800.

The previous prime is 20211002121143. The next prime is 20211002121251. The reversal of 20211002121222 is 22212120011202.

It is a happy number.

20211002121222 is a `hidden beast` number, since 20 + 211 + 0 + 0 + 212 + 1 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20211002121195 and 20211002121204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7396273 + ... + 9753299.

It is an arithmetic number, because the mean of its divisors is an integer number (347759053824).

Almost surely, 2^{20211002121222} is an apocalyptic number.

20211002121222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211002121222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25038651875328).

20211002121222 is an abundant number, since it is smaller than the sum of its proper divisors (29866301629434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20211002121222 is a wasteful number, since it uses less digits than its factorization.

20211002121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357215 (or 2357201 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20211002121222 its reverse (22212120011202), we get a palindrome (42423122132424).

The spelling of 20211002121222 in words is "twenty trillion, two hundred eleven billion, two million, one hundred twenty-one thousand, two hundred twenty-two".